.M-FlipCard {
    display: inline-block;
    position: relative;
    width: 60px;
    height: 100px;
    line-height: 100px;
    border: solid 1px #000;
    border-radius: 10px;
    background: #fff;
    font-size: 66px;
    color: #fff;
    box-shadow: 0 0 6px rgba(0, 0, 0, 0.5);
    text-align: center;
    font-family: 'Helvetica Neue';
  }
  
  .M-FlipCard .digital:before,
  .M-FlipCard .digital:after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    background: #000;
    overflow: hidden;
    box-sizing: border-box;
  }
  
  .M-FlipCard .digital:before {
    top: 0;
    bottom: 50%;
    border-radius: 10px 10px 0 0;
    border-bottom: solid 1px #666;
  }
  
  .M-FlipCard .digital:after {
    top: 50%;
    bottom: 0;
    border-radius: 0 0 10px 10px;
    line-height: 0;
  }
  
  /*向下翻*/
  .M-FlipCard.down .front:before {
    z-index: 3;
  }
  
  .M-FlipCard.down .back:after {
    z-index: 2;
    transform-origin: 50% 0%;
    transform: perspective(160px) rotateX(180deg);
  }
  
  .M-FlipCard.down .front:after,
  .M-FlipCard.down .back:before {
    z-index: 1;
  }
  
  .M-FlipCard.down.go .front:before {
    transform-origin: 50% 100%;
    animation: frontFlipDown 0.6s ease-in-out both;
    box-shadow: 0 -2px 6px rgba(255, 255, 255, 0.3);
    backface-visibility: hidden;
  }
  
  .M-FlipCard.down.go .back:after {
    animation: backFlipDown 0.6s ease-in-out both;
  }
  
  /*向上翻*/
  .M-FlipCard.up .front:after {
    z-index: 3;
  }
  
  .M-FlipCard.up .back:before {
    z-index: 2;
    transform-origin: 50% 100%;
    transform: perspective(160px) rotateX(-180deg);
  }
  
  .M-FlipCard.up .front:before,
  .M-FlipCard.up .back:after {
    z-index: 1;
  }
  
  .M-FlipCard.up.go .front:after {
    transform-origin: 50% 0;
    animation: frontFlipUp 0.6s ease-in-out both;
    box-shadow: 0 2px 6px rgba(255, 255, 255, 0.3);
    backface-visibility: hidden;
  }
  
  .M-FlipCard.up.go .back:before {
    animation: backFlipUp 0.6s ease-in-out both;
  }
  
  @keyframes frontFlipDown {
    0% {
      transform: perspective(160px) rotateX(0deg);
    }
  
    100% {
      transform: perspective(160px) rotateX(-180deg);
    }
  }
  
  @keyframes backFlipDown {
    0% {
      transform: perspective(160px) rotateX(180deg);
    }
  
    100% {
      transform: perspective(160px) rotateX(0deg);
    }
  }
  
  @keyframes frontFlipUp {
    0% {
      transform: perspective(160px) rotateX(0deg);
    }
  
    100% {
      transform: perspective(160px) rotateX(180deg);
    }
  }
  
  @keyframes backFlipUp {
    0% {
      transform: perspective(160px) rotateX(-180deg);
    }
  
    100% {
      transform: perspective(160px) rotateX(0deg);
    }
  }
  
  .M-FlipCard .number0:before,
  .M-FlipCard .number0:after {
    content: '0';
  }
  
  .M-FlipCard .number1:before,
  .M-FlipCard .number1:after {
    content: '1';
  }
  
  .M-FlipCard .number2:before,
  .M-FlipCard .number2:after {
    content: '2';
  }
  
  .M-FlipCard .number3:before,
  .M-FlipCard .number3:after {
    content: '3';
  }
  
  .M-FlipCard .number4:before,
  .M-FlipCard .number4:after {
    content: '4';
  }
  
  .M-FlipCard .number5:before,
  .M-FlipCard .number5:after {
    content: '5';
  }
  
  .M-FlipCard .number6:before,
  .M-FlipCard .number6:after {
    content: '6';
  }
  
  .M-FlipCard .number7:before,
  .M-FlipCard .number7:after {
    content: '7';
  }
  
  .M-FlipCard .number8:before,
  .M-FlipCard .number8:after {
    content: '8';
  }
  
  .M-FlipCard .number9:before,
  .M-FlipCard .number9:after {
    content: '9';
  }